A girl moving in with MY boyfriend?

Sami

Okay so me and my boyfriend and going strong 14 months, the occasional fights but we make up the day of. I really love him but lately he has taken in a girl from my school who is from Spain, she didn’t like her host family so his family took her in. Now my boyfriend and his family are fluent in Spanish, and obviously so is the girl from Spain. This girl has been added to their family group chat, goes everywhere with them (obviously since she lives with them) and he is even trying to teach her how to play video games... I love video games and so does he. Should I be jealous? Am I overreacting? It literally pisses me off so much. Even today she was showing off a picture of my boyfriend that she found from the family group chat. Don’t get me wrong she’s a nice girl but like, is this a thing I should let go? I feel like I am not as loved by him and his family, but again that might just be me overreacting.